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Sire × testing regime interactions in growing pigs

Published online by Cambridge University Press:  02 September 2010

L. C. M. de Haer
L. C. M. de Haer
Affiliation:
Research Institute for Animal Production‘Schoonoord’ PO Box 501, 3700 AM Zeist, The Netherlands
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Abstract

Central test data of two pig breeding companies were analysed to estimate sire × testing regime (S × T) interaction for ultrasonic backfat thickness (BT), life-time growth rate (GL) and growth rate during test (GT). Testing regime consisted of a combination of sex, test period and housing system (individual v. group housing). Data were analysed within five lines, with 5417, 8331, 3427, 2413 and 1263 records of progeny of 97, 162, 64, 69 and 33 sires, respectively. The data were collected from May 1983 until May 1987 (lines 1, 2 and 3) and from June 1985 until May 1987 (lines 4 and 5). Testing regime had a significant effect on BT (in three lines) and on GL and GT (in five lines). S × T interaction was significant only for BT in three lines and for GT in one line. Genetic correlations between identical traits, measured under the two testing regimes, varied from 0·64 to 1·00 for BT, from 0·65 to 1·00 for GL and from 0·62 to 1·00 for GT. Conclusively, within central test S × T interactions were relatively unimportant for BT, GT and GL.

Keywords

interactionspigsprogeny testing
Type
Research Article
Information
Animal Production , Volume 51 , Issue 2 , October 1990 , pp. 357 - 363
Copyright
Copyright © British Society of Animal Science 1990

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